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Zaviyalov N, Zhalov M, Zhang B, Zhang C, Zhang L, Zhang M, Zhang S, Zhang X, Zhang Y, Zhang Z, Zhao M, Zherebchevskii V, Zhi Y, Zhong C, Zhou D, Zhou Y, Zhu J, Zhu Y, Zugravel S C, Zurlo N
Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
Nuclear Physics Institute of the Czech Academy of Sciences, Husinec-Řež, Czech Republic.
Phys Rev Lett. 2024 May 31;132(22):222303. doi: 10.1103/PhysRevLett.132.222303.
K^{+}K^{-} pairs may be produced in photonuclear collisions, either from the decays of photoproduced ϕ(1020) mesons or directly as nonresonant K^{+}K^{-} pairs. Measurements of K^{+}K^{-} photoproduction probe the couplings between the ϕ(1020) and charged kaons with photons and nuclear targets. The kaon-proton scattering occurs at energies far above those available elsewhere. We present the first measurement of coherent photoproduction of K^{+}K^{-} pairs on lead ions in ultraperipheral collisions using the ALICE detector, including the first investigation of direct K^{+}K^{-} production. There is significant K^{+}K^{-} production at low transverse momentum, consistent with coherent photoproduction on lead targets. In the mass range 1.1<M_{KK}<1.4 GeV/c^{2} above the ϕ(1020) resonance, for rapidity |y_{KK}|<0.8 and p_{T,KK}<0.1 GeV/c, the measured coherent photoproduction cross section is dσ/dy=3.37±0.61(stat)±0.15(syst) mb. The center-of-mass energy per nucleon of the photon-nucleus (Pb) system W_{γPb,n} ranges from 33 to 188 GeV, far higher than previous measurements on heavy-nucleus targets. The cross section is larger than expected for ϕ(1020) photoproduction alone. The mass spectrum is fit to a cocktail consisting of ϕ(1020) decays, direct K^{+}K^{-} photoproduction, and interference between the two. The confidence regions for the amplitude and relative phase angle for direct K^{+}K^{-} photoproduction are presented.
K⁺K⁻对可能在光核碰撞中产生，要么来自光生ϕ(1020)介子的衰变，要么直接作为非共振K⁺K⁻对产生。K⁺K⁻光生的测量探测了ϕ(1020)与带电K介子和光子以及核靶之间的耦合。K介子 - 质子散射发生在远高于其他地方可获得的能量处。我们使用ALICE探测器首次测量了超外围碰撞中铅离子上K⁺K⁻对的相干光生，包括对直接K⁺K⁻产生的首次研究。在低横向动量处有显著的K⁺K⁻产生，这与铅靶上的相干光生一致。在高于ϕ(1020)共振的1.1<Mₖₖ<1.4 GeV/c²质量范围内，对于快度|yₖₖ|<0.8且pₜ,ₖₖ<0.1 GeV/c，测量的相干光生截面为dσ/dy = 3.37±0.61(统计)±0.15(系统) mb。光子 - 核（Pb）系统每个核子的质心能量WγPb,n范围从33到188 GeV，远高于先前对重核靶的测量。该截面大于仅ϕ(1020)光生的预期值。质量谱拟合为由ϕ(1020)衰变、直接K⁺K⁻光生以及两者之间的干涉组成的混合谱。给出了直接K⁺K⁻光生的振幅和相对相位角的置信区域。
